I don't trust bike shops to take care of my mountain bike, I don't want to break my neck because of some mechanic. That's why I do my own service. I don't fly

I don't trust bike shops to take care of my mountain bike, I don't want to break my neck because of some mechanic. That's why I do my own service. I don't fly anymore but I guess next time I'm going to have to build my own aircraft.